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Polyolefin multilayer microporous film and its manufacturing method

A microporous membrane, polyolefin technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve problems such as the inability to obtain shutdown temperature, and achieve excellent electrolyte injection and shutdown characteristics. The effect of suppressing deterioration and achieving a longer life

Active Publication Date: 2017-12-08
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, there will be problems such as not being able to obtain sufficient shutdown temperature

Method used

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  • Polyolefin multilayer microporous film and its manufacturing method
  • Polyolefin multilayer microporous film and its manufacturing method
  • Polyolefin multilayer microporous film and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0187] (1) Preparation of the first polyolefin solution

[0188] Prepare the first polyolefin composition by dry blending, relative to the total weight of the first polyolefin composition, comprising (a) Mw of 2.5×10 5 HDPE (Mw / Mn: 8.6, terminal vinyl group concentration is 0.1 / per 10000 carbon atoms) 97% by weight, (b) Mw is 9.7×10 4 Polypropylene (Mw / Mn: 2.6, melting point 155°C) 3% by weight. With respect to every 100 parts by weight of the first polyolefin composition, dry blend 0.2 parts by weight of tetrakis [methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionate] methane as anti- An oxidizing agent is used to formulate the first polyolefin resin.

[0189]30 parts by weight of the first polyolefin resin was supplied to the intensive kneading twin-screw extruder, and 70 parts by weight of liquid paraffin (40° C., 50 cSt) was supplied to the twin-screw extruder from a side feeder. Melt-kneading was carried out at 210° C. and 200 rpm to prepare a first polyolefin sol...

Embodiment 2～ Embodiment 7 and comparative example 1～ comparative example 8

[0195] Based on the raw materials and conditions shown in Table 1 and Table 2, a polyolefin multilayer microporous membrane was produced in the same manner as in Example 1. Examples 2, 7 and Comparative Examples 2 to 4 were subjected to second stretching (re-stretching) at the temperature and magnification shown in the table, and then thermal relaxation treatment was performed in the TD direction. In the state on the machine, heat setting treatment was performed at the re-stretching temperature for 10 minutes to produce a polyolefin multilayer microporous film. In addition, "-" in Table 1 and Table 2 indicates that UHMwPE or HDPE2 in the table is not included and that no heat relaxation treatment was performed.

[0196] [Table 1]

[0197]

[0198] [Table 2]

[0199]

[0200] Table 3 and Table 4 show the physical properties of the polyolefin microporous membranes of Examples 1 to 7 and Comparative Examples 1 to 8. In addition, "-" of Comparative Example 2 in Table 4 in...

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Abstract

The present invention provides a polyolefin multilayer microporous membrane which is excellent in oxidation resistance, electrolyte injection property, and shutdown characteristics, and further excellent in permeability and strength balance. The polyolefin multilayer microporous film is a polyolefin multilayer microporous film obtained by forming a gel-like sheet using a polyolefin resin containing polypropylene, stretching the gel-like sheet in at least one direction, and washing the polyolefin multilayer microporous film. The first microporous layer, at least one surface layer is the first microporous layer, the electrolyte injection property is below 20 seconds, and the polypropylene (PP) of the first microporous layer is distributed uniformly in the in-plane direction, The shutdown temperature is below 132°C.

Description

technical field [0001] The invention relates to a polyolefin multilayer microporous film and a manufacturing method thereof, in particular to a polyolefin multilayer microporous film which can be used as a separator for batteries and a manufacturing method thereof. Background technique [0002] Polyolefin multilayer microporous membranes can be used in various applications such as battery separators, electrolytic capacitor separators, various filters, waterproof and moisture-permeable fabrics, reverse osmosis filtration membranes, ultrafiltration membranes, and microfiltration membranes. When polyolefin multilayer microporous membranes are used as separators for batteries, especially lithium-ion batteries, their performance is closely related to battery characteristics, battery productivity, and battery safety. Therefore, it is required to have excellent permeability, mechanical properties, heat shrinkage resistance, shutdown properties, melting properties, and the like. Fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32C08J9/26H01M2/16H01M50/406H01M50/449H01M50/451H01M50/457H01M50/489H01M50/491H01M50/494
CPCB32B27/32B32B27/08B32B2307/7265Y02E60/10H01M50/449H01M50/491H01M50/406H01M50/489H01M50/451H01M50/457H01M50/494
Inventor 石原毅
Owner TORAY IND INC
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